Question about Televison & Video
* Tech Stuff *
Audio CDs do not spin at a constant rate. They are designed to be read (for music) at a "constant linear velocity" of about 1.25 meters per second. The data is written in a tight spiral starting at the inside of the CD. The CD spins the fastest when reading the inside tracks and slows down as it reads towards the outside edge. Imagine circles on the CD surface. The inside ones would be smaller than the outside ones, of course. So, if you are reading evenly-spaced bits on the lines of those circles, you would need to read fewer outside circles per second than the small inside circles.
* Basic Issue *
When the player is reading Track 1 the CD is spinning at about 500 rpm. During the last tracks of a (full) CD it only needs to spin at about 200 rpm. It doesn't work the other way around for compatibility reasons.
* More Info *
This is why you are experiencing the difference in mechanical noise at different tracks. It doesn't necessarily reflect a defect, but understandably, a consumer would prefer a quieter system, which does differ between manufacturers and models (I couldn't specs for a KS200 HK device) Yet, if the noise is substantial, it may very well be indicative of a problem, e.g. something stuck in the drive and being whipped around in a circle at high speed. I wouldn't say this is particularly likely.
* Possible Help *
What would normally mitigate this issue is not getting too close to the player while listening. Normally having the primary listening position several few feet away (across the room) would suffice to minimize noise heard from fans and spooling CDs.
Posted on May 14, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
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If you REALLY want to blow up your speakers, crank it to 11 like Spinal Tap would do ;-)
Nigel Tufnel: The numbers all go to eleven. Look, right across the board, eleven, eleven, eleven and...
Marty DiBergi: Oh, I see. And most amps go up to ten?
Nigel Tufnel: Exactly.
Marty DiBergi: Does that mean it's louder? Is it any louder?
Nigel Tufnel: Well, it's one louder, isn't it? It's not ten. You see, most blokes, you know, will be playing at ten. You're on ten here, all the way up, all the way up, all the way up, you're on ten on your guitar. Where can you go from there? Where?
Marty DiBergi: I don't know.
Nigel Tufnel: Nowhere. Exactly. What we do is, if we need that extra push over the cliff, you know what we do?
Marty DiBergi: Put it up to eleven.
Nigel Tufnel: Eleven. Exactly. One louder.
Marty DiBergi: Why don't you just make ten louder and make ten be the top number and make that a little louder?
Nigel Tufnel: [pause] These go to eleven.
Feb 21, 2011 | Harman Kardon AVR 130 Receiver
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